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(p,  ) reaction via transfer reaction of mirror nuclei and direct measurement of 11 C(p,  ) 12 N at DRAGON Bing Guo For nuclear astrophysics group China.

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Presentation on theme: "(p,  ) reaction via transfer reaction of mirror nuclei and direct measurement of 11 C(p,  ) 12 N at DRAGON Bing Guo For nuclear astrophysics group China."— Presentation transcript:

1 (p,  ) reaction via transfer reaction of mirror nuclei and direct measurement of 11 C(p,  ) 12 N at DRAGON Bing Guo For nuclear astrophysics group China Institute of Atomic Energy The Sixth China Japan Joint Nuclear Physics Symposium May, 2006

2 Content (p,  ) reaction via transfer reaction of mirror nuclei. 1. Mirror symmetry 2. 8 Li(d,p) 9 Li and 8 B(p,  ) 9 C2. 8 Li(d,p) 9 Li and 8 B(p,  ) 9 C Mg(d,p) 27 Mg and 26 Si(p,  ) 27 P3. 26 Mg(d,p) 27 Mg and 26 Si(p,  ) 27 P Direct measurement of 11 C(p,  ) 12 N at DRAGON. Direct measurement of 11 C(p,  ) 12 N at DRAGON.

3 A(d,p)B angular distribution Neutron ANC of virtual decay B → A + n Proton ANC of virtual decay D → C + p and proton width Astrophysical S-factor and rate of the C ( p,  ) D reaction Mirror symmetry If A and C, B and D are mirror nuclei, then DWBA analysis Radiative capture theory Charge symmetry

4 Neutron ANC from A(d,p)B L. D. Blokhintsev et al., Sov. J. Part. Nucl. 8, 485 (1977). is the ANC of d → p + n. is the ANC of B → A + n.

5 Proton ANC and width of mirror nucleus D N. Timofeyuk et al., PRL. 91, (2003). BACK

6 8 Li(d,p) 9 Li and 8 B(p,  ) 9 C Motivation: 8 Li(d,p) 9 Li is one of important reactions in the inhomogeneous big bang models*, can serve as a surrogate reaction to extract the 8 B(p,  ) 9 C and 8 Li(n,  ) 9 Li reaction rates for the direct capture. *T. Kajino and R. N. Boyd, Astrophys. J. 359, 267 (1990).

7 Secondary beam facility X. Bai et al., NPA 588, 273c (1995). W. Liu et al., NIM B204, 62 (2003). Dipole Gas target Quadrupoles Wien Filter MCP1 MCP2 Reaction Chamber

8 Experimental setup

9 9 Li particle identification

10 Angular distribution of 8 Li(d,p) 9 Li  =7.9 ± 2.0 mb Z.H. Li, W.P. Liu, X.X. Bai, B. Guo et al., Phys. Rev. C 71, (R) (2005).

11 8 B(p,  ) 9 C 7 Be(p,  ) 8 B(p,  ) 9 C( ,p) 12 N(  + ) 12 C is one of possible alternative paths to 3  process ; 8 B(p,  ) 9 C may play an important role in the evolution of massive stars with very low metallicities. M. Wiescher et al., Astrophys. J. 343, 352 (1989). G.M. Fuller et al., Astrophys. J. 307, 675 (1986). Motivation:

12 Current status and our proposal on 8 B(p,  ) 9 C Several theoretical studies; Proton transfer 8 B(d,n) 9 C reaction by RIKEN; Coulomb dissociation measurement by RIKEN; Knockout reactions of 9 C by Texas A&M University and Michigan State University; Neutron transfer 8 Li(d,p) 9 Li reaction and charge symmetry of mirror nuclei.

13 8 Li(d,p) 9 Li is peripheral?

14 Astrophysical S-factor of 8 B(p,  ) 9 C This work presents an independent examination to the existing studies. M. Wiescher et al., APJ. 343, 352 (1989). P. Descouvemont, NPA 646, 261 (1999). P. Mohr, PRC 67, (2003). D. Beaumel et al., PLB 514, 226 (2001). L. Trache et al., PRC 66, (2002). T. Motobayashi, NPA 719, 65c (2003). J. Enders et al., PRC 67, (2003).

15 8 B(p,  ) 9 C reaction rate B. Guo, Z.H. Li, W.P. Liu et al., Nucl. Phys. A 761, 162 (2005). BACK

16 26 Al × 10 5 yr 26 Mg The MeV  -ray is an ideal observable for nova and x-ray burst. 26 Si(p,  ) 27 P reaction J. José et al., Astrophys. J. 520, 347 (1999). O. Koike et al., Astron. Astrophys. 342, 464 (1999).

17 Current status and our proposal on 26 Si(p,  ) 27 P Several theoretical studies ; Measurement of resonant capture via Coulomb dissociation method by RIKEN ; No measurement of direct capture ; Determination of direct and resonant captures through neutron transfer reaction 26 Mg(d,p) 27 Mg and charge symmetry of mirror nuclei.

18 Angular distribution of 26 Mg(d,p) 27 Mg

19 26 Mg(d,p) 27 Mg is peripheral?

20 ANCs of 27 Mg and 27 P 27 P

21 Proton widths for 27 P H. Herndl et al., Phys. Rev. C 52, 1078 (1995). J. A. Caggiano et al., Phys. Rev. C 64, (2001).

22 Astrophysical S-factor of 26 Si(p,  ) 27 P

23 26 Si(p,  ) 27 P reaction rate B. Guo, Z.H. Li, X.X. Bai et al., Phys. Rev. C 73, (2006).

24 More reactions we can do 6 Li(d, p ) 7 Li → 6 Li(p,  ) 7 Be 7 Li(d, p ) 8 Li → 7 Be(p,  ) 8 B 11 B(d, p ) 12 B → 11 C(p,  ) 12 N 12 C(d, p ) 13 C → 12 C(p,  ) 13 N 13 C(d, p ) 14 C → 13 N(p,  ) 14 O 14 N(d, p ) 15 N → 14 N(p,  ) 15 O …… BACK

25 Direct measurement of 11 C(p,  ) 12 N at DRAGON Alternative way to the 3  process for transforming material from the pp chains to the CNO. Play an important role in the evolution of Pop Ⅲ stars. Indirect data have large discrepancies.

26 Existing indirect results of 11 C(p,  ) 12 N

27 proposed by Prof. W.P. Liu

28  ISOL approach(500 MeV proton), successful producing beams such as 8,9,11 Li, 21 Na.  Some difficulty producing beams of volatile elements such as 11 C, 13 N, 15 O and 19 Ne in required intensities (~10 8 /s). Production of 11 C

29 Alternative approach - using 13 MeV proton beam from TR13 Production Chemical or physical separation Transfer to OLIS OLIS ionization ISAC RB

30 Intensity vs. collection time Run No. Sample radioactivity (mCi) Beam intensity (ions/s) ECR efficiency ± 1.5(9.9 ± 0.4) ×10 6 (1.9 ± 0.2) % Beam of 11 C were produced successfully. Beam intensity ~6×10 8 ions/s when 11 C radioactivity of (1 Ci) produced by the TR13 medical cyclotron.

31 Produce 11 C (and other isotopes) without using the 500 MeV p+ beam is possible. The beam intensity can meet the needs of radiative proton capture study using DRAGON. The limitation is efficiency of the ion source. Conclusions of 11 C production M. Trinczek, S. Lapi, B. Guo et al., Can. J. Phys., (in press).

32 Research Team of Nuclear Astrophysics at CIAE Bing Guo Gang Lian Weiping Liu Xixiang Bai Baoxiang Wang Sheng Zeng Zhihong Li Shengquan Yan Yongshou Chen Nengchuan Shu Kaisu Wu Youbao Wang Experiment Theoretical Jun Su

33 Thanks !


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